addrmap Peripheral {
    regfile {
        default regwidth = 32;

        reg {
            name = "COOL_REGISTER";
            field {
                name = "COOL_FIELD";
                sw = w;
                hw = rw;
                woset = true;
            } cool_field [31:0];
        } cool_register @ 0x0;
        reg {
            name = "UNCOOL_REGISTER";
            field {
                name = "UNCOOL_FIELD";
                sw = rw;
                hw = rw;
                onwrite = wzt;
                reset = 1;
            } uncool_field [31:0];
        } uncool_register @ 0x4;
    } registers @ 0x100;
};